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Absorbed dose thresholds and absorbed dose rate limitations for studies of electron radiation effects on polyetherimidesThe threshold values of total absorbed dose for causing changes in tensile properties of a polyetherimide film and the limitations of the absorbed dose rate for accelerated-exposure evaluation of the effects of electron radiation in geosynchronous orbit were studied. Total absorbed doses from 1 kGy to 100 MGy and absorbed dose rates from 0.01 MGy/hr to 100 MGy/hr were investigated, where 1 Gy equals 100 rads. Total doses less than 2.5 MGy did not significantly change the tensile properties of the film whereas doses higher than 2.5 MGy significantly reduced elongation-to-failure. There was no measurable effect of the dose rate on the tensile properties for accelerated electron exposures.
Document ID
19890015961
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Long, Edward R., Jr. (Old Dominion Univ. Norfolk, VA., United States)
Long, Sheila Ann T. (NASA Langley Research Center Hampton, VA, United States)
Gray, Stephanie L. (NASA Langley Research Center Hampton, VA, United States)
Collins, William D. (Old Dominion Univ. Norfolk, VA., United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1989
Subject Category
Nonmetallic Materials
Report/Patent Number
NASA-TP-2928
L-16585
NAS 1.60:2928
Accession Number
89N25332
Funding Number(s)
PROJECT: RTOP 506-43-21-04
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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